Sealed connecter



May l, 1934- I E. L. LIPMYAN 1,956,869

SEALED CONNECTER Filed Feb.- e. 1951 Patented May ll, 1934 l UNITED STATES PATENT OFFICE SEALED CONNECTER Carl E. L. Lipman, Chicago, Ill., assigner to Lipman Patents Corporation, Chicago, Ill., a corporation of Delaware v Application February 6, 1931, Serial No. 513,960

1 Claim. (Cl. 173-311) This invention relates to a seal particularly cured to the outer member in such a manner as suitable as a sealed connection for an electrical to increase the tightness of the joint between the device to permit the passage of an electrical casing and the outer member.v The conductor' conductor such as a lead-in wire through a heror extended lead is passed through the two memmetically sealed enclosure surrounding the elecbers and is sealed thereto. trical device. A better understanding will be had of this Considerable d-iiculty has been experienced invention from aconsideration of thev drawing in the pastin providing sealed connectionsof and detailed description given in connection this type such as lead-in wires for electrical detherewith, in which:A f l vices wherein the electrical device was enclosed Fig. l is a side elevation of the elements conin a sealed container. An illustration of such an stituting the seal embcdyingthe principles of this instance is a hermetically sealed motor compresinvention, arranged in spaced relative positions sor unit of a refrigerating system. In such an prior to assembling. application the difficulties are further increased Fig; 2 is a transverse section through the cenbecause of the temperature and pressure conditer of the elements shown in Fig. 1.

tions and because it is usually desired to have a Fig. 3 is a transverse section through approxisealed connection or lead-in wire that is removmately the center of the connection completely able or at least insertable after the casing and assembled and in position. p unit has otherwise been closed. It is of course Fig. 4: iS a tranSVerSe Scctcn thl'Ollgh an 3D- necessary to insulate the lead-in wire and to sea1 plioation embodying three connections in differthe wire to the insulation and the insulation to ent Stages Of assembly the casing in gas-tight relation. Fig. 5 is a transversesection through a fur- It is the purpose of this invention to provide ther modified forni Of thiS inVcntiOn. a connection which is capable of withstanding Referring Particularly t0 that fcrrn 0f thiS shocks, vibration and changes in temperature as invention illustrated in. Figs. 1 t0 4 inclllSiVe, it Well as pressure, which will effectively seal an Will be Seen that the ccnnectcn cOrnDriSeS an electrical conductor by a high resistance insu- Outer Sleeve-like or Socket member 1 of animlating member adapted to be inserted after sub- DerViOliS insulating material preferably havingj stantially all other elements have been completed Seine inherent resiliency 0r yieldability, Cylindriand which is removable or replaceable in the cal in formation and having the major DOrtiOn 85 event that a defective seal is discovered and to 0f itS Outer periphery tapered and threaded aS provide such a seal, at 2 terminating in a projecting annular rim 3 It is a further object of this invention to proat one end and in a nut for engagement with vide such a seal that is particularly well adapted a Wrench at the Other end. `The material Of to extend a motor lead through the sealed casing Which the Sleeve iS cOInDOSeCl, While DOSSeSSing 90 Surrounding a motor compressor unit of a sealed yieldability or resiliency in a broad sense, cannot refrigerating system wherein the connection will POSSeSS these' characteristics t0 the extent that be subject to high pressures and changes in temrubber does which, because of its extreme comperature. pressibility and its liability to deterioration when 4.0 In accordance with thisinvention a pair of subjected t0`0il 0r high temperatures both of 9:?

sealing members having cooperative wedging Which are present in the sealing case of a hersurfaces are provided which, in combination with metieelly Sealed refrigerating machine, iS quite a suitable aperture formed in the casing through .unsuitable fOr the DUIDOSBS 0f` my iIiVentiOnwhich the conductor is to be passed, cooperate Yieldability in the Sense 0f ductility 01 Semito form a gas-tight seal for an electrical conduc- Plasticity iS contemplated by my invention. 190

tor passing through the two members, In the Sleeve 1 is bored centrally, the center portion preferred form of this invention although not of the bore being tapered Aand threaded as at 4, the only form, an outer insulating member is prothe threaded portion of the bore being concentric vided which is formed with an exterior tapered With the outer threaded portion and lying within surface adapted to be received in and secured to the terminating enClS thereof. 105

a correspondingly tapered hole in the casing A11 inner Plug 01 Wedge-like member 6, Dreithrough which the conductor is to be'extended. erbly formed of a conductive material harder The outer member is adapted to cooperate with than the insulating material of the sleeve, is proand to receive a correspondingly tapered innerv vided and has a tapered threaded end portion 7 member, the inner member being tapered and seof proper diameter and pitch to rit Within the 110 tapered threaded bore 4 of the outer member 1. The opposite end portion of the inner member is squared or otherwise provided with hat surfaces to permit the plug member to be engaged by a wrench. The plug member is also provided with a central bore to receive a conductor or lead wire 8 having upon its inner end an eye 9 for attachment to the lead 10 of the electrical device.

In use the casing 11 for sealing the electrical device is prepared with a tapered opening therethrough threaded as at 12 to receive and engage the tapered threaded portion 2 of the outer member 1. The eye 9 of the conductor 8 is secured to the lead 10 and is passed through the threaded opening 12 of the casing. The outer member 1 is then slid over the conductor 8 and screwed tightly into the threaded opening 12, the plug 6 is then inserted over conductor 8 and screwed tightly into the inner threaded bore of the outer member. The screwing of the plug G into the sleeve 1 acts as a wedge and tends to spread sleeve 1 outwardly against the casing to Ltightly seal the same against both the inner plug which is relatively harder than the outer sleeve and also against the threaded aperture through the casing 11 thus making a gas-tight seal between plug 6, shell 1 and casing 11. The conductor 8 is then pulled outwardly to bring eye 9 within the rim 3 which serves as an insulating enclosure for the eye after which the conductor 8 is sealed as by soldering at 13 to the projecting end 14 of the plug 6.

In the modication shown in Fig. 5 the connection is substantially like that shown in Figs. l to 4 inclusive modied to a certain extent, that is, the wedge or expanding member' 26 is a solid electrically conductive member to which the motor lead 10 and extended lead are directly soldered or otherwise secured. For this purpose the inner end of the wedge member is provided with a reduced tip 27 to which the motor lead 10 may be secured and the outer end is provided with a reduced tip 28 to which the continuing wiring may be soldered.

From the foregoing description it will be apparent that there has been provided a connection suitable for many purposes and embodying generally two wedge members and means for drawing the same together in such a manner as to tightly seal each against the other and against the wall of the opening through the supporting casing. AIn the specific embodiment illustrated in Figs. 1 to 4 inclusive the tapered threads formed upon the tapered walls form a plurality of associated cooperating wedged surfaces which when jammed together form a perfect impervious seal therebetween. When the conductor is sealed to the inner member the complete connection is absolutely gas-tight and is particularly well adapted to withstand high pressures and varying temperatures without breaking down.

It is also apparent from the description that the construction permits of the insertion of the connection as the last element in assembling the machine and also provides for removal and replacement should any defect occur or should it 'De desired to get into the casing for any reason whatever.

It is obvious that minor changes may be made in the details of construction without departing from the spirit and scope of this invention as dened in the claimv appended hereto.

I claim:

The combination with a casing provided with an inwardly tapered and tappedv lead in opening, of an insulating sleeve formed of high temperature and pressure resisting material capable of being deformed by mechanical action, said sleeve being ext-eriorly tapered and threadedly engaged in said opening, the bore of said sleeve being tapered and tapped, and a non-deformable tapered, exteriorly threaded plug threaded into said bore with sufficient force to expand said sleeve into hermetic sealing relation with the surrounding walls of said opening, and an electrical lead wire connected to said plug.

CARL E. L. LIPMAN. 

